Coupling Nut Material Grade/Class Grade 2H Material Steel Finish Black Oxide Thread Size 1 In.-8 Thread Style Fully Threaded Hex Width 1 5/8 in Overall Length 2 3/4 in Dimensional Standards ASME B18.2.2 Material Quality Standards ASTM A194 2H System of Measurement Inch Thread Direction Right Hand Pack Size Small Pack Rockwell Hardness 28 Min